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David Cameron has promised to examine historic allegations about a high-powered paedophile ring after he was warned that there was “clear intelligence” linking it to a former Downing Street aide.

Tom Watson, the Labour MP who campaigned against phone hacking, said that the Metropolitan Police could hold information linking a former No 10 aide to a notorious group of paedophiles.

He said he had been informed that connections to the aide, whom he did not name, had been unearthed in the prosecution of Peter Righton, a child care expert who was convicted in 1992 of importing child pornography. “The evidence